To the



(.No Model.)

C. P. RUSSELL.

DRILLINGF MACHINE.' y 110,537,719. 1 PatentedApp. 16,1895.

Eff

STATES? .PATnNT QFICE.

'cannons P. RUSSELL, onfennnnntntn MASSACHUSETTS, ASSIGNOR- To 'runWiner genossen. MANnnAoTURiNeCOMPANY, ,on SAME PLACE.

" DR'iLLl N caf-MAC Hi n E...

SPECIEICATION forming page of Letters raient No. 537,719,

date April 1e, ieee.

Application filed .lannarj 29, 1895. Serial Il'a. 536.542; (No model.)

.To ez/Z weom Mn/ray concern/.-

' Be it known theol, CHARLES P. RUSSELL, a

` citizen lof the United States, residing at Greeniield, in the countyof Franklin and-.State of; ldassachnsette, have invented certa-in 'neveAand -us'efnl.Improvements in Drilling'f- Machinos; and I dohereby-declare the followingl v lto be a fnlhclea'r, and exactdescription vof the invention, such as. will enable others skilled inthe art to which it appertains'to -inake and nsethesarne.`

My invention relatesto improvements in drilling machines, and especiallyto certain improvements upon the drilling 'machine d escribed' inthepatentV tol 'Smartfand Martin,

1895,' and nrbereddated February `13, 534,180. l' .Y

It has'been found that in thedrilling" -rnachine described in theapplication aforesaid,-

there ie a tendency of the' drill" to-feed for- Iward toorapidlylafterthejplatie being drilled `has been perforated nearlyfor qiiitethrongh.causingthe veaid drilltooatc'h oifiliirid inthe broken hole andalsocauelingthe 'point to sharply strikethe. table Tor support Afor' the:said plate andyb'reaking the' said drillor the point thereof. Thisdefect has been remedied l A lReferenceie had/to theA accom panyingfdraw inge;- izn which Vthe esame'l parts are `indicated bytie sameletters Throughout the several views.

Shown in Fig. 2.1 'Figfe-frepresents avieivon an enlaijged4 scale ot'the adjustable collarconnecte'd-to the vscrewthneaded drill spindle forregulating, or controlling, the downward n10- tion of the saine.;and'hfig. 5` represents-a vdetailedvievv showing-.1an ordiiiary'nuft'need inlstead of the adjustable collar shown in Fig. e.

Alrepresents'thefbed plate wliichis providedlivith the lugs A, A2 land`Ain which i thedrill spindle iejvonrnaled.. 'lhefbed plate "ii-raiseprovided with afraine Aiinwhich the 5el shaft of the driving gear E isjournaied,and

'vided.`

volved by xneansobthe gear wheels E and F,

' justable handle E.

.ismounted the drillCgwhile at the upper" end of the drill spindle theywheel D ispro,y

The drill spindle and drill are retheforrner being turned by means ofthe adthedriving shaft may lie driven by an57 snitvable gearing, otherthan by hand, if desired.

It will be obvious that" I Tfheltable K has a heel le' which slides upand down between guides on the bed plate `A,and is clamped in positionbynieausof the handlever kivhich operates a pawl engaging in the rackA",as is well known in drilling .machines of this character.

The feedlinotion isV given to the 'drill by means of the hand wheel IIwhich has a scr'ewi .threaded hub engaging the screw-threads on thedrillspindle andv bears, Iwhen feeding-,- against the ball bearing li asdescribed fully in -thc application of Smart and lilartinab` readyreiferred `to. This wheel may also be `braked mechanically by means olthe thumb .screw Ilandsuitable brakes similar to those.

described in the application referred to.

In order to prevent thev drill spindle lroin lfeeding down too rapidiywhen thoplate being bored `'is nearly orqnite borcd through, a suitablestop such as tho-set collar 1, or thc nut Pf is adj usted at the desireddistance above asuitable Dulfer which. rests'on any part of the lixedframe work oi' the machine. This i bnller may be either a disk of rubbereuclra's is shown at M, or aspring M., or a combination of the tivo, orany other suitable bulier.

"ihedistanec between the stop and the bnlierV should 'preferably beabout thcth'ickfncss ol' f--thd plate to bc bored through; The stopshown in Figel to Ellis in the forni of a sel.' collaiii. with resilientarms. p' Vclanngcd tc- Spindle.. Wher'oa nul; is uscdas shown in 'getherbyfmcans of theV thumb scrcwp, where# l bythe' said 'collar is setfirmly ou thcdrill` f we 2 I serale 5, it is simply screwed upvor downto the desired point, and will revolve with the drill spindle untilthesaid drill spindle is fed down as low as desired, when the nut shouldbring up against the buffer. 'Beneath the buter there should he veithera plain washer Q as shown in Fig. 3, or awasher Qradapted 'to I formpart of the ball bearing*I R as shown in Fifi. 2.

lbriilngs up against the bilder, the rotation of the drill spindlewillbe transmitted to the buffer and to washer Qv or Q', but withoutscrewing up on the set collar 1, or more especially, upon the nut P. Itwill thus be seen that the rubber disk lli, or the spring lli will actas a buer to arrest the downward feed of the drill, thus preventingr thedrill from being broken by feeding down too rap- I idly and strikingthetabie K. This provision of abuing device to cheek the feed ofcounter-sinks is of special importance since the points of thesetoolsare Very readily broken.

The position of the butter on the drill spindle isl immaterial, providedthe device be so arranged that the pressure is thrown on the butter whenit is taken off from the materiall similar to that herein described maybe used upon 'drilling machines of all kindswbere there is a tendency togreatvirregularities in the feed. These, and the various other' advantages of the herein described construction, will readily suggestthemselves 'to any one skilled in the art.

Having thus described my invention, what' I claim, and desire to-secureby Letters Patent of the United States, is v v 1. In a drilling machinethe combination with a bed plate with journal bearings therein for thedrill spindle, of a drill spindle screwthreaded along'a portion of itslength and free to revolve in said bearings, a hand feed wheelv providedwith a. screw-threaded hub engaging the screw threads onsaid spindle,the said hub fitting snugly between two of said bearings,'a stop mounted,on said drill spindle, land a bu der interposed between said stop andpart of the frame work of the ma- In either case when the ndt or collar'-on said drill spindle, a w

.interposed between said stop andsaid was chine, and adapted to bestruck by said stop at a given point of the feed, substantially as'described. i

2. In a drilling vmachine the combination with abed plate with journalbearings therein for the drill spindle, of a drill spindle screw#threaded along a portion of its length free to revolve in said bearings,av hand feed wheel 'providedw'ith a screwthreaded hab engaging the screwthreads on said spindle, the said hub fitting snugly between two of saidbearings, an adjustablev stop monnted on said drill spindle, a washerinclosingr said drill spindle, and supported by the trarne work of themachine, and a buffer interposed between stop and saidA washer andadapted 'to be struck by said stop, at the desired point of feed,substantially as described.

3. In a drilling machten the combination with abed plate with ,iournalbearings therein 1 for the drill spindle,ot` n drill spindle screwthreaded along a portion of its length and free to revolve in saidbearings, a hand feed wheel provided with a screwthreaded hub"v engagingthe screw threadson said spindle,

the said nnb fitting snugly; between two ot said bearings, an adjnzf'ble stop mounted er inoiosing drill spindle, a ball bearing interposedbef tween said washer and the frame work ot the machine, and a bufferplaced between washer and.. said stop and adapted tolle s? nel; I.bysaid' stop at the desired 'point. of feed, sub;

stantially as described..

4. In a drilling machine, the combination 9o with a bed plate wi th1iournal bearings therein for the drill spindle, of a drill spindlescrew# threaded along a portion of its lengthfand free to revolve insaid bearings, a-feed nut engaging the screwthreads on said spindle, 95

,the hub of said nut fitting snugly between two of said bearings, anadjustable stop mounted on said drill spindle, a Washer inclosing saiddrill spindle, and Asupplanted the framework of the machine, and aand-adapted to be struck by said stop at t. a desired point of feed,substantially scribed.A

In testimony whereof l atixI my signatnre in presence et two witnesses.

y CHARLES P. itnessesz y, v FRANots N; THOMPSON, y 'LOTTIE IE.STnAT'roN.

